monsieur

[muh s-yur; French muh-syœ] /məsˈyɜr; French məˈsyœ/
noun, plural messieurs
[meys-yurz, mes-erz; French me-syœ] /meɪsˈyɜrz, ˈmɛs ərz; French mɛˈsyœ/ (Show IPA)
1.
the conventional French title of respect and term of address for a man, corresponding to Mr. or sir.
Origin
1490-1500; < French: literally, my lord (orig. applied only to men of high station); see sire
British Dictionary definitions for monsieur

monsieur

/French məsjø; English məsˈjɜː/
noun (pl) messieurs (French) (mesjø; English) (ˈmɛsəz)
1.
a French title of address equivalent to sir when used alone or Mr when placed before a name
Word Origin
literally: my lord
Word Origin and History for monsieur
n.

1510s, from French monsieur, from mon sieur "my lord," from sieur "lord," shortened form of seigneur (see monseigneur) It was the historical title for the second son or next younger brother of the king of France.

Encyclopedia Article for monsieur

the French equivalent both of "sir" (in addressing a man directly) and of "mister," or "Mr." Etymologically it means "my lord" (mon sieur).

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